Automatic toll ticketing system



ug. 24, i948. J. B. RETALLACK AUTOMATIC TOLL TICKETING SYSTEM l2 Sheets-Sheet 1 Filed June 27, 1942 D D l] U ATTORNEY l2 Sheets-Sheet 2 Filed June 27, 1942 NNK m M mf. Nl. wm

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V. B vom www ArroRA/Ev Aug. 24, E943. .1. B. RETALLACK 294479533 AUTOMATIC TOLIL TICKETING SYSTEM Filed June 27, 1942 l2 Sheets-Sheet 3 ATTORNEY Aug. 24, w48. J. B. RETALLACK AUTOMATIC TOLL TICKETING SYSTEM 1.2 Sheets-Sheet '4 Filed June 27, 1942 PJBRETALLACK ATTORNEY Aug 24, 48. J. BWRETALLACK 2,447,33

AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 12 Sheets-Sheet 5 (l rw, R07:

A GHUP TRI/Aff( FINER um gli um] nun /m/E By Jam-TALL f AHORA/5y ACK u. 24, i948. J, B, RETALLACK 2,4753@ AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 y l2 Sheets-Sheet 6 ATORNEV FIG. 6

ug 24 48 J. B. RETALLACK 2,447, l

AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 A l2 Sheets-Shaml '7 /NvE-NToR BPJBREMLLACK ATA/EV Aug. 24, 394S- J. B. RETALLACK 447533 AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 12 Sheets-Sheet 8 C005 AND NUMERICAL REG/STERS /NVENTOR J B. REMLLACK ANEV Aug. 24, 1948. J. B. RETALLACK AUTOMATIC TOLL TICKETING SYSTEM 12 Sheets-Sheet 9 Filed June 27, 1942 b. ME am.

Aug. 24, i948. .1. B. RETALLACK 2,447,533

AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 12 Sheets-Sheer. 10

f- /NvEA/mn J BREMLLACK Aug. 24, 1948. J. B. RETALLACK 2,447,533

AUTOMATIC TLL TICKETING SYSTEM Filed June 27. 1942 12 sheets-sheet 11 T0 LAST SENDER llll lllllllllllllllll T0 LAST mil/VA* SENDER lllllll'llllllllLllllll llll llll .reune-n rnwvk com/Ecran' amau/r A INVENTOR JBRETALLACK ug. 24, E948. J. B. Rr-:TALLACK 2,447,533 AUTOMATIC TOLL TICKETING SYSTEM Filed June 27, 1942 l2 Shee'cs-Shee'l l2 Il llllylllllllllllllll Illlllll'llllllllllllll )WEA/ron J BRU/MACK TTU/@MEV Patented Aug. 24, 1948 .2,447,533 y aU-'rolun'rrcl 'roLL 'rIcksfrINcfY SYSTEM .lohn B. Retallack, New York, N. Y., assignor to, Bell Telephone Laboratories,y Incorporated, New York, N. Y., a corporation of; New AYork Application .I une '27, 1942;-Serial No.144857'83 9 Claims.

'This invention relates to a telephone system for enablingwcalling subscribers to control the establishment of toll connections by dialing and in whichsystem a toll ticket having thereon all of the data required for billing a toll call is automaticallyprinted. More particularly the invention relates toimprovements in a system ci the general type disclosed in Patent 2.300,829, granted November 3, 1942, to J. YW. Gocderham.

In the system of the Gooderham patent, a group of tandem or automatic ticketing trunks is provided, each trunk' having a ticket printer. A subscriber desiring a connection to a line terminating in an oiiice in the nearby toll area dials theof'ce code and numerical digits of the wanted line numberand in response to the dialing of one or more of the oice code digits a connection is extended to an idle one of the ti-cketing'trunks which has access to the cnice in which the wanted line terminates. Immediately following the seizure cf the trunk. an idle sender common to the ticketing trunks is associated with the'seized trunk. Theisender is provided with registers for registering the remaining digits of a called line number dialed' by the calling subscriber and with registers for registering the digits ofv the. calling line number.

Since, however, a digit dialed by a calling subscriber might be lost during the time elapsing from the seizure'ofA the trunk-and before the idle sender becomes associated with the trunk, the trunk is provided With a digit register for registeringl the digit dialed following the last code digit'dialedfto reach the trunk. Since the trunk lmay be seized' by a rst selector in response to thefdialing lof the rst office code digit 'of` certain called o-iiice'designations by a secondselector in response-tol the dialing of the iirst twoA oice code digits of other oice designations-and byfa thi-rd selector in` `response to the dialing 'of all .three oiiice code digits of still other office-designations. theregister in the trunk mayregister either the Ysecond or third oice code. digit or the thousands numerical digit. As-soonas thefiirst digit has beenregistered in the sender, whichfdigit maybe either the third olice code digit, the thousands digit or the hundreds digit, an idle identifier is associated with the sender' overean identifier connector and the identier is associated directly with the trunk over a identi-fier trunk connector. Thereupon the identifier reconstructs the oiiice codedialed-bythe calling subscriber, which information maybe derived from the trunk -or from the trunkandsenderfand transmits this informationto-the sender. The

..2 f identi-fieralso: proceeds to identify the calli-ng-l line and to. transmit infomation concerning` the designationdigits ofr -suchcalling liney to the sender.

...The .senderafter registering the. cnice-code digits of the .wanted line number transmitted tol it from thev identiierand the numerical digits of the wanted-.line number dialed into thesender from the calling line, proceeds. to.. direct the settingv of ,selector switchesto extendav connection fromthe ticketing. trunk tothe wanted subscribers line. Suchcalled oicecode and numericalregistrations vare falso, effective to. control the printer of the trunk to. `print on the toll ticket, the office code. and numericalv digits which identify the called vline. In. addition, they registrations oftheoilicecode. and numerical digits of the calling iinertransferred to thesenderfrom the identi.- fierare electiye to control the vprinter toprint such digits on the toll ticket. Provision is .also made for printing otherdata required for ticketingthefcallsuch.asthe date and time the call was` made and. theelaps'edtime .of the conversation.

yItis an objectof the ypresent invention tofurther improve. an. automatic. ticketing systemA 0i they type above described and. particularly toimprove the-ticketing. trunk whereby .the ticket printer thereof is controlled in a simple. and. reliable manner. vfrom the sender to print. information. Ion the, ticketin `accordance. with dataregistered' in.- the lsender anddata registered in a month, day and, hour circuit associable with. the sender.

.Itis a lfurther .object of the. invention to enable the registration` of the elapsed. time ,ofv conversation in the trunk. andtoI control the ticket .printer in accorda-nce therewith to .printdigitsindicative of such elapsed conversational time on the ticket. l

j It isa. still further object of the invention. to provideA alarm. facilities inthe trunk operableiin the .eventa sender is unable. to. complete the con,- trol ot printingfor in theevent the yticket yprinter fails to; complete. theprinting of the elapsed time -on the, ticket Within a predetermined` period.

Othercobjects fof .theinvention will be apparent from .theiollowing discussion of the invention.

To attainV the firstobiect of the inventionY the type-wheel shaft of the printerisproyided .with a `brush whichsweeps over distributor segments, one. for each. character; andr which isV arrested. in its vmovement by theoperation of. theprintmagnet when the brush engages the` segment grounded` from the sender-.in accordance, with the character to be printed. The operation of the print magnet closes the stepping circuit of a stepping relay in the sender which closes the stepping circuit of a progress switch and locks itself to another contact of the print magnet and releases the print magnet. When the print magnet releases to restart the distributor brush, the stepping relay of the sender releases to permit the advance of the progress switch for controlling the printing of the next character.

To attain the second object of the invention the trunk is provided with a 'units elapsed time register which is advanced at quarter minute intervals during the continuance of'consersation and after the elapse of a ten minute interval causes a one step advance of a second or tens elapsed time register. These registers 'are arranged to register up to 99 minutes of conversation whereupon the ticket printer is controlled to print a notation to the effect that conversation overY the established connection has lasted for 99 minutes, whereupon the registers are restored and if the conversation continues, the elapsed time' over 109 minutes is registered vfor printing at the termination of the conversation. Theitrunk is also provided Ywith a digit register which, immediately following the seizure of the trunk is steppedY in 'accordance with a digit of the called lineY number which registration is subsequently transferred to the identifier and ultimately to the sender to assistin the establishment ofthe connection over the trunk to the desired line. .Following the transfer of the digit registration from this register, the register is restored to normal and thereafter is employed as a progress switch and controlled in its step-by-step advance by the printer to control the printer to print information on the ticket in accordance with the settings of the tens and units elapsed time register..

To attainthe third object of the invention the trunk is provided with an alarm relay for controlling the circuits of an alarm lamp individual to the trunk and an audible alarm common` to a group of trunks. V'Ihis alarm relay may be operated from thesender in the event ci trouble conditions arising therein which would prevent the .sender from completing its control of the ticket printer, may be operated from a timing circuitcommon to a group of trunks in the event theticket printer does not complete the printing of the. elapsed time on the ticket within a specied interval and which may be operated in response to other trouble conditions.

The invention having been` described in a generalmanner. reference maxT now be had to the followingdetailed description thereof taken in connection with the accompanying drawings in which:

Fig. 1 shows a two-party line. the schematic representation of a line finder; iirsigsecond and third selector switches over which access may be had to an idle one of a pluralitiT of automatic ticketing trunks. one of which is disclosed in Figs. 2. 3 and 4. and to the right oi the dot-dash line. the schematic representation of a trunk-finder of a B group, of trunk-finders, individual .fora sender for connecting such sender with a calling one of a B group of one hundred ticketing trunks;

Figs. 2 3 and 4 taken together show a complete ticketing trunk including a digit register,

duration of conversation registers and an automatic ticket printer:

Fig. 5 shows a trunk-finder of the A group of 4 iinders individual to the same sender as the trunknder of Fig. 1 for connecting the sender with a calling one of an A group of one hundred ticketing trunks;

Figs. 6 to 10, inclusive, show such portions of a sender as are deemed necessary for an understanding of the invention; Figs. 6, 7 and 8 showing control relays Iand Fig. 8 also showing a progress switch for successively associating groups of sender registers with the ticket printer of Fig. 4; Fig. 9 showing in the lower left portion one of the sender registers and a box representing other registers, a box representing an identifier and timing equipment of the sender, and Fig. 10 showing inthe lower portion thereof the sender monitoring trunk and the relay equipment of the sender associated therewith and in the upper portion thereof, the dial pulse receiving circuit ofthe sender;

Fig. 11 shows a sender-trunk-connector of an AV group for connecting any seized sender with the ticketing trunk of the A group of ticketing trunks which has seized such sender;

Fig. 1 2 shows a sender-trunk-connector of a B group for connecting any seized sender with the ticketing trunk of the B group of ticketing trunks which has seized such sender; and Y Fig. 13 is a chart showing how the several gures of the drawing should be arranged to fully disclose the invention.

The line finder |83 and the selector switches |84., |815 and |86 Aof Fig. 1 are of the well-known step-by-step type and the selector switches are operative in response to the dial of a calling line to establish local connections or to establish a connection with an idle automatic ticketing trunk, such as is disclosed in Figs. 2, 3 and 4, should the subscriber desire a connection to a subscribers line which terminates in the toll area adjacent to the exchange area in which the calling line terminates. As disclosed, the ticketing trunk of Figs. 2, 3 and 4 has a branch which terminates in the bank of a first selector |84, another branch which terminates in the bank of a second selector |85, and still another branch which terminates in a bank of a third selector |86 whereby the trunk may be seized in response to the dialing of ltheilrst office code digit of a certain distant Aoicegin response to the dialing of the iirst and second oiice code digits cf another office and in response tothe dialing of the three oftlce code digits of Astill another office.

The elapsed time registers 400 and |50 and the ldigit register V35u associated with the ticketing trunk andthe progress switch 850 of the sender are of the well-known rotary step-by-step type. The brushes 35| and 352 of the digit register are advanced step-by-step in response to the operation of the Vstepping magnet 353 and are restored bythe operation of release magnet 35A. The brushes 40| and 402 of register 400 are advancedstep-by-step by stepping magnet 403 and are restored by release magnet 404 and the brushes of register 450 and progress switch 850 are advanced step-by-step from their normal positions and are returned to theirnorma-l positions by arfurther forward stepping movement.

VThe ticket printing mechanism 460 associated with the'automatic ticketing trunk may be of the type disclosed in Patent No. 2.309.688, lgranted February2. 1943, to W. J. Zenner.

Two trunk-iinders of the step-by-step double brush set type are individualized to each sender. One pair of such trunk-finders is disclosed in Fig. 5 and in the right portion of Fig. 1. One

brush set; of: 'the Ander: shownin; full in Fig.vv 5 has. access to an. upper bank' ofterminals in which control conductors from a. first. one hundred vticketing trunks terminate. and' the other brush set'. has access toa lower bankofxterminals in which other'control conductors from the same one hundredtrunks terminate. One brush set.

of the B finder shown schematically in the rightvv portion of Fig. 1 has. one brush set which. has access to. an upper bank of terminals ink which controlconductors from a second one hundred ticketing trunks terminate and a. second brush setwhich has access toa. lower bank of termi-- nals in which other control conductors of the same one hundred trunksV terminate.

Since a trunk-finder does not have suflicient brushes. in both of its. brush sets to accommodate all of the control conductors required Lbetween a trunk andk a sender, a plurality of -additional sender trunkconnector circuits is provided, that shown iny Fig. 11 havingv a multicontact relay individual to each senderandi ten multicontact relays individual respectively to ten. trunks. of such circuits serve the A group of. one hundred trunks. Fig. l2shows one of the ten similar circuits which serve. the B group of one hun-y dredv trunks.

As'previously stated only so much of one of the senders is disclosed as is deemed necessary for a complete understanding of the invention, only one of the registers of the sender being partly disclosed in Fig; 9 and the circuits for contro-llingl out-pulsing vbeing omitted. The month, dayv and hour circuit and identier have not been disclosed as they are` concerned only incidentally with the present invention. For a full disclosure of the Lentire system, to which the present invention is applicable, reference may be had to the application of` J. W; Good'erham, Serial- No. 448,782, led concurrently herewith.

To more clearly set forth the novel features of the invention, it will first be assumed that the tip party whose substation is id'entiledbyy the numeral |8| in- Fig. l, initiates a call for a toll connection to asubscribersv line terminating in an oiice of a toll area to which. the calling` subscriber is permitted access by dialing. Upon the removal of the receiver from the switchhook, an idle line nder having access to the calling line,

such as the line nder- |83, is started in. search of the calling line in a well-known manner. When the line lnder has found the calling line the usual dial tone is transmitted over the calling line to inform the subscriber that his line has been connected with -a irst selector |84, paired with the line nder |83, and that he may therefore commence dialing the digits of the' wanted line number.

It will be assumed thatv the calling subscriber desires a connection with a lineA whoseadirectory number is MAR-1345 and a ticketing trunk'over which the connection may be extended may beA reached from the sixth level ofthe bank ofv rst selector |34. The calling subscriber upon hearing the'dial tone therefore proceedsv to dial the office code letters M, A, R and the numerical digits l, 3, 4 and 5. In response to the dialing of the first oice code letter M, which has a numerical equivalent 6, the iirstv selector |04 is operated to elevate its brush set to a position opposite the sixth bank level and to then hunt over the terminals of this level in search of an idle ticketing trunk. It will be assumed that the trunk disclosed in Figs. 2, 3, and 4 is idle and that thereforel when the testA or sleeve brush of Ten selector |84 :engages the test or sleeve terminal ['81 of thebranch of` this trunk, it i'lnds no busy ground potential thereon and therefore the selector seizes. the trunk.. A circuit is thereupon electivefrom ground at the selector over the:

backucontact orrelay 205 and through resistance 20S' to .battery and ground. Relay 203 operates.

fromy the low resistance battery thus supplied, locksgfrorn battery through its lower winding and over its. lower front contact to the sleeve conductor S2102, opens the vinitial operating circuit through'its upper winding, connects its lower winding over its upper and lower front contacts in parallel with the winding of relay 205, and prepares a circuit over its inner lower front con.- tact vfor a. purpose to be later described. Relay 205 also operates and removes resistance 205 from the. parallel connection with its winding. As soon as the talking circuit is cut through at the selector |00, a circuit is established from ground through the lower winding of relay 207, over the lower No. 3 back contact of relay 200, the upper No. 3 back contact of relay 200, the upper No. 5 back contact of relay 2|0, tip trunk conductor 200, tip brushes of selector |04 and linender |83, over the calling line loop through the substation |I, thence. returning over the ring brushes of the line finder |03 and selector |80, ring trunk conductor 20|, the lower No. 2 back contact of relay 2 l0, the upper No. 4 back contact of relay 209, the upper No. 5 back contact of relay 200 to battery through the upper winding of relay 201. Relay thereupon operates closing over its front contact a circuit for slow-to-release relay 2|| which may be traced from ground-over the upper No. 5 back contact of relay 209, over the front contact of relay 207, tobattery through the winding of relay 2 Relay 2| thereupon operates, establishes a circuit for slow-to-release relay 300, extending from battery through its winding, over conductor to ground over the middle lower contacts of relay -2| I; prepares over its upper contact a circuitV for the stepping magnet 353 of the digit register 350, and for the slow-to-release relay 302; connectsv ground from the lower No. 3 back contact of relay 214, over its inner lower front contact, the lower No. 3 back contact of relay 2|5 to the trunk start conductor 2|0 which is common to the ten trunks of a subgroup and establishes a connection from ground and battery through the windingl of relay 2|5, the upper No. 2 back con tact of relay 2| 4, the lower Contact of relay 2| l, to conductor 2 to mark the trunk as calling so that thel started trunk-finder will stop on the terminals of such trunk. Relay 300, upon operating, connects ground over the lower No. 2 back contact of relay 303, the lower front contact of relay 300, conductor 304, over the inner No. 1

circuit of relay 302 previously prepared by the operation of relay 211, are completed from ground over the upper No. contacts of relay 209, the back contact of relay 201, the upper contact of relay .211, conductor 212, the lower normal contacts of off-normal switch 355 of the digit register 350, through the lower normal contacts and winding of relay 302 to battery and ground and in parallel over the upper No. 4 back contact of relay 305, through the winding of stepping magnet 353 to battery and ground. Magnet 353 and relay 302 both operate, relay 302 because of its slow-to-release characteristic remaining operated until the termination of the impulse series. Upon the first step advance of the register brushes 351 and 352, the o-normal switch 355 becomes operated, whereupon the operating circuits of relay 302 and magnet 353 are extended over the lower alternate contacts of relay 302, over the circuit traced to ground over the contacts of relay 20S. Since the second code letter dialed was A, two impulses are transmitted in the impulse series and brushes 351 and 352 are advanced to the second terminal positions of their'arcs. Upon the termination of this impulse series relay 302 releases.

In the meantime, however the connection of ground to the trunk-lnder start conductor 216 has caused the operation of the group start relay 50IL which is allocated to the last subgroup of ten trunks of the A group of one hundred trunks, Ten group relays are provided individual respectively to the ten subgroups of trunks of the A group, one of the group relays individual to an intermediate subgroup being shown at 5011 and the group relay of the ,first group being shown at 50IF. Ten similar group relays would be provided for the ten subgroups of the B group of one hundred additional trunks and associated with the B group of trunk-finders, one of which is disclosed schematically inFig. 1. Group relay 501L upon operating connects ground over its inner lower contact to the level segments 503 of the vertical commutatore 502 of all trunkiinders of the A group having access to the A group of trunks; connects ground to the trouble alarm circuit 504 and causes the operation of the start relay 509 of the first idle trunk-finder. The trunk-finders are divided into preference subgroups in accordance with the subgroups of trunks whereby any trunk of a subgroup has the preferential use of the trunk-iinders and associated senders of a particular subgroup. If at any time all the trunk-finders which lare first choice preference of a subgroup of trunks are busy such subgroup of trunks then has second choice use of the trunk-iinder of another subgroup which is normally the iirst choice of another subgroup of trunks.

The trunk-finder 500 disclosed in Fig. 5 is the iirst finder ol the last group of finders allocated as first choice to the last subgroup oi trunks to which the group relay 501L appertains. It will be assumed that this finder is idle and that therefore upon the operation of relay 50IL, a circuit is established from ground over the back contact of relay 505, the upper contacts of relay 5011., in start conductor 506, over the middle normally closed contacts of the test and busy jack 501 of the trunk-iinder 500, the inner upper normal contacts of relay 508, through the winding of start relay 509 to battery and ground. Relay 509 upon operating connects ground over its inner upper front contact to conductor 510 and causes the operation of stepping relay 511 in a circuit extending from ground over the inner lower front contact' of relay 509, interruptor contacts oi vertical magnet 512, interrupter contacts of rotary magnet 513, the lower winding of relay 511 to battery and ground over the inner lower back contact of relay 508. Relay 51,1 upon operating causes the operation of the vertical stepping magnet 512, over a circuit extending from ground at the inner lower front contact ol relay 505, over the front contact oi relay 511, the upper back contact oi relay 514, through the winding of magnet 512 to battery over the inner lower back contact of relay 500. The brush shaft of the finder is thereby lifted one step, placing the commutator brush 515 on the rst wired segment of the vertical commutator 502, The vertical oli-normal springs 515 are now operated to their alternate positions and the ycircuit of relay 51 1 is opened at the interrupter contacts oi magnet 512. Relay 5H now releases in turn releasing magnet 512 which in turn recloses the circuit of relay 511. Relay 511 reoperates to cause the reoperation of magnet 512. In this manner magnet 512 is repeatedly operated and released to advance the brush shaft upwardly step-by-step until the commutator brush 515 engages the grounded segment 503 whereupon a circuit is established from ground on such segment over brush 5i5 through the lower winding and relay 514, over the interrupter contacts of rotary magnet 513, through the lower winding of relay 511 to battery and ground over the inner lower back contact of relay 508. Relay 51 1 is thus held operated to prevent further stepping and relay 514 which is slow to operate operates after an interval suicient to permit the brushes to cease vibrating following the completion of their last vertical stepping movement and before they are started in their rotary stepping movement.

When relay 515 operates, it locks in a circuit from `battery over the inner lower back contact of relay 508 through the winding of magnet 512, through the upper winding and inner upper front contact of relay 514, to ground at the inner lower front Contact of relay 509, opens at its innel' lower back contact, the circuit extending over the lower contacts of the off-normal switch 515 through the winding of release magnet 511, and transfers the stepping circuit control of stepping relay 511 from the vertical magnet 512l to the rotary magnet 513. With stepping relay 511 now operated, the circuit of the rotary magnet 513 may be traced from ground over the inner lower front contact of relay 509, contacts of relay 511, upper iront contact of relay 514, through the winding of magnet 513 to battery and ground. Magnet 513, upon operating, advances the brush set of the finder one step in a rotary direction and opens at its interrupter contacts the holding circuit ior relay 51 1 previously traced and the operating circuit thereof extending from ground over the inner lower front contact of relay 509, the interrupter contacts of magnet 512, the interrupter contacts of magnet 513, the lower winding of relay 511 to battery over the inner lower back contact of relay 508, whereupon relay 5I I releases in turn releasing magnet 513. Magnet 513 upon releasing reestablishes the operating circuit of relay 511, which in turn reestablishes the circuit of magnet 513 to advance the brush sets another step in the rotary direction. In this manner the brush sets are advanced step-by-step until the test brush 518 encounters the test terminal 519 of the calling trunk.

It has been assumed that the calling trunk of Figs. 2, 3 and 4 appears in the last terminal set 'of the levels of the banks of the trunknder599 corresponding to the cormnutator segment :593 which levels are partly shown and therefore when the brush sets have been stepped vertically to a position opposite such levels in their banks, as illustrated and have been advanced ten steps in the rotary direction into engagement with the last terminal sets of such levels, a circuit will be established from battery applied through the winding of relay 2|-5 of the trunk, over conductor 2I'l, to the test terminal5| 9, thence over test brush 8, through the lower Awinding of relay upper back contact of relay V599 through the up per winding of relay 5I I to ground on vconductor 5I9. Relay 5II is held. operated over this circuit to prevent further rotary stepping of the switch shaft, and relay 529 operates sufciently to close rits upper No. l contacts thereby establishingr a vcira cuit from battery, through its upper winding, 'over such contacts, the lower contacts 'of rotary magnet 5|3, contacts of relay `51| 'to groundrover the inner lower contacts of relay 599. With both of its windings now energized, relay 529 fully operates to extend control conductors 2 I9 to229, in-clusive, of the trunk over brushes l52| to 529., inclusive, of the trunk-finder and the upper Nos. 4 and 5 and lower Nos. 2 to 5 contacts of lrelay 529 to conductors 52'! to 532, inclusive, extending to the sender; to cause the operation of relay 599 in a circuit extending from ground over the oir-normal springs 5 I 9, the No. 3 upper front contact of relay 529, through the lower winding of relay 598 to battery and ground; to connect sender conductor 533 over its lower No. 1 contacts to brush 534, thence to conductor 535 which is multipled to corresponding bank terminals in the same vertical row of the upper finder bank; to open at its No. 3 upper back contact another point in the circuit of release magnet 5H, and 'to prepare a locking circuit for itself over its No. vl upper front contact which will be effective following the operation of relay 598.

Relay 598 upon operating extends a connection from trunk conductor 2 Il, over terminal 5I9 and brush EIS, the upper No. 2 contacts of relay 529 and the upper front contacts of relay 598 to conductor 5 I 9 extending to the sender completes the locking circuit of relay 529 extending from bat*- tery through the upper winding and No. 1 upper contacts of relay 529, the lower front contact of relay 599 to ground on conductor 5 I 9; disconnects the lower winding of relay 529 from the test brush 5I9; transfers at its inner upper contacts theinstart conductor 595 from the winding of start relay 599 to the out-start conductor 552,` and through the upper winding of relay 598 to battery at the upper back contact of relay 535; at its inner lower back contact removes battery from the windings of relays 5I I and 5M, and from the vertical magnet 5I2 and at its upper front ccntact shunts the upper winding of relay 5I I. lRyelays 5|I and 5l@ now release and relay 599Wbeing slow to release releases after an interval sufficient to allow ground to be applied to conductori5|9 at the sender to hold relay 529 and relay 2|5 of the trunk operated.

When relay 5I9 releases the continuity of the out-start conductor is established at its` lower contacts whereby if a second trunk in the same subgroup should be in a, calling condition, ground placed on the in-start conductor 599 will be effective to start the second trunk-finder of the same subgroup of finders, if it is idle, over a circuit extending from conductor 596 overthe midalle normal contacts of test jack 591, the inner upper front contacts of relay 509, the lower nord mal contacts of relay 5M', conductor 552, the lower normal contacts of test jack 597', the middle normal contacts of test jack 501 associa-ted'with the second trunk-finder of the same trunk-finder group, over the upper normal contacts of relay 598 to the start relay of such second finder cor*- responding to relay 599.

Had the calling trunk been in the subgroup of a second or -B group of 'one hundred trunks, va group -relay I9IL corresponding to one of the group relays 59|, associated with the A group of trunk-finders would have been operated to cause `the operation of the start relay of an vidle trunk-finder such for example as the start relay |09 of the trunk-finder |09 of Fig. 1. It is to be noted that the finder 599 is paired with the rinder I 99 and the brushes thereof are connectable to conductors 5I9 and52`| to 533, inclusive, 4to which the brushes of the trunk-finder are also connectable and which extend to a sender. In order therefore that it may not be possible to connect two trunks to a single sender Vover the brushes ofthe pair of trunk-nders 599 and |99, the nder 599 is made a preference nder and the start -circuit for the nder |99 is extended from ground at the contacts of the group relay I 9 IL over conductor |99, the inner upper normal contacts of relay |98 of the finder |99, conductor 554, over the lower back contact of relay 599 of finder 559, conductor 555, through the winding of start relay |99 of the finder |99 to battery. If the finder 599 is in use, its relay 599 will be operated and consequently the start circuit cannot be completed to start relay |99 of finder |99. However, the'start circuit will be extended overconductor 559, the lowerfront contact of relay 599, conductor 555, over the inner upper normal contacts of relay |98 of the first available n'cler of the B group, thence over the back contacts oi the relay 599 of the finder of the A group paired therewith, to the start relay |99 of such available finder if the paired A group finder is not in use or overa front contact of relay 599 and over contacts of similar relays 599 and |98 through the start relay |99 of a B group nder whose paired A group finder is not in use.

When the trunk-finder seizes the terminals of the calling trunk and completes the cir-cuit previously traced from battery through the winding of relay 2| 5 over conductor 2|?, relay 2I5 operates and locks itself directly to ground applied over conductor 2H from the trunk-finder and at a later time from the sender, over its upper No. 1 front Contact. As soon as relay 392 releases following the completion of the registration of the impulse series in the digit register 359 a circuit is completed for transfer relay 299 which may be traced from battery through its winding, over conductor 2I5, the lower back contact of relay 396, the upper back Contact of relay 392, conducto'r saune upper No. 2 liront Contact ofre1ay 2I'5, conductor 398, the upper contacts of offnormal switch 355 of register 350 to ground kover the lower No. 3 back contact of relay 393. Relay 299 operates whereupon the dialing circuitvpreviously traced over the calling line loop and through the windings of relay 291 is disconnected from the windings of such relayand transferred to the selected sender. Relay 291 now releases followed by the' release of slow-to-releas'e relay 2| I, but with relay 2|5 now operated, relay 399 is held operated over a circuit extending from battery through its winding over conductor 39|, the

lower No.1 contact of relay 2I5 to groundover y the lower No. 3 back contact oi relay 2|0.

Shouldan idle sender, not be connected to the trunk before the secondtrain cir-impulses is received in the trunk, relays 2|5 and 209 will not be operated and, therefore, when relay 201 releases on the irst'impulse'of this digit series a circuit will be established from ground over the upper No. normal contacts to relay 200, the back Contact of relay 201, the upper front contact of relay 2 I I, conductor 2 |2, the lower alternate contact of off-normal Contact 355, the inner upper back contact of relay 302, through the winding of relay 3|0 to battery, whereupon relay 3|0 operates and establishes a circuit from battery through the winding of relay 2|4, over conductor 3| I, the lower contacts of relay 3 I0, to ground over the upper No. 2 back contact oi relay 305. Relay 2|4 therefore operates, locks over its upper No. 1 contacts and conductor 3|2 to ground over the inner lower front contacts of relay 300; applies all-paths busy tone'iroin the source 230 over its lower No. l contacts, the tip conductor 200 of the trunk and thenceY to the calling line; connects ground over its lower No. 3 front contact, the normal contacts of jack 204 and thence as traced to sleeve conductor 202 to hold the selector |84 and the line finder |83 from releasing; at its lower No. 3 back'contact removes ground from start conductor 2|0 extending to the trunkiinder and at its lower No. 2 back contact opens the connection from ring conductor 220 extending over the lower No. 5 back contact of relay 2 0, over the lower No. 1 back contact of relay 232, the lower No. 2 back contact of relay 2|4, through resistance 23|, over the lower No, 1 normal contacts of relay 209 to the tip conductor 2|0, whereby the sender when attached is given a disconnect signal. Y

In response to the all-paths Vbusy tone the calling subscriber restores his receiver to the switchhook, whereupon relay 201 releases followed by the release of relay 2I| and the release of relay 300. With relay 2|4 operated the sender, if attached, will have received a disconnect signal and will thereby cause the release of relay, 2I5 of the trunk. With relays 2| I, 2|5 vand 300 all released a circuit is established for release magnet 354 of digit register 350 which may be traced from battery through its winding over conductor 3|3, the upper back contact of` relay 2| I, the upper No. 2 back contactof relay 2|5, conductor 308, the upper contact of oil-normai springs 355 to ground over the lower No. 3 back contact of relay 303. Magnet 354 thereuponoperates to release the brushes 35| and 352 of register 350 to their normal position whereupon springs 355 restore to their normal position thereby opening the circuit of magnet 354. Relay 300, upon releasing, also releases relay` 2|4. With relays 300 and 2|4 both released holding ground is removed from the winding of sleeve relay 203, which releases, and from sleeve conductor 202 to initiate the release of the :operated selector |34 and line nder |83. l n

It will be assumed, however, that an idle sender is attached to the trunk prior to the receipt oi the second impulse series in the trunk. Prior to the operation of transfer relay 209 a loop circuit is established from battery through the middle winding oi dial impulse responsive relay |000 of the sender, through retard coil |00I, conductor |002, the lower No. 4 back contact of relay 800, conductor 80|, the inner upper back contact of relay 100, conductor the lower No. l normal contacts of relay 000, the lower No.3 back contact of relay 60|, conductor 528, the upper No. 4 contacts of relay 520, brush 522 of trunknder 500, conductor 220, the lower No. 5 back contact of relay 2|0, the lower No. 1 back'contact of relay'232, the lower No. 2 back contact of relay 2|4, resistance 23|, the lower No. 1 normal contacts of transfer relay 200, conductor 2|9, brush 52| of trunk-ilnder 500, the upper No. 5 contacts of relay 520, conductor 521, the upper No. 2 back contact of relay 600, the upper No. 1 normal contacts of relay 600, conductor 102, the inner lower back contact of relay 100, conductor 802, the upper No. 2 back contact of relay 800, to ground. The retard coil |00| in series with the middle or primary winding of relay |000 and the lcondenser |003 and resistance |004 connected in parallel with the retard coil |00|` and middle winding of relay |000 constitutes an arrangement which enables relay |000 to withstand transient conditions and thereby give satisfactory pulsing. The upper or secondary winding of relay |000 is connected in series with condenser |006 and resistance |001 to reinforce the primary winding and make its operation and release more positive and therefore more insensitive to transients. The lower or tertiary winding serves as a biasing winding and tends to keep the relay armature in its released or back contact position.

At the time ground was connected to conductor 5|0 at the trunk-finder 500, a circuit was cornpleted over the upper No. 1 normal contacts of relay 103, over the inner upper normal contact of relay 104, to battery through the winding of off-normal relay whereupon relay 105 operates to connect ground to the oil-normal ground conductors 106 to 1|0, inclusive, of the sender. Ground is, therefore, connected over conductor 101, the upper No. 2 back contact of relay 002 and conductor |0| to the armature of relay |000 and through the lower or biasing winding of relay |'000 and resistance |0|2 to battery. As previously stated, relay |000 is thus biased to hold its armature on its back contact to thereby shunt and discharge condenser I0 I3 through resistance |0|4 until the dialing loop is completed through the middle winding of relay |000 as previously traced.

When relay |000 operates over the loop a circuit is established from ground on conductor |0| over the front contact of relay |000,`conductor |0|0, the lower No. l back contact oiV relay 603, conductor |000, through the winding of relay |008 and resistance |001 to battery and in parallel with resistance |001 to battery throughthe winding of relay |0|5. Relay |008 operates and releases with relay |000 but relay |0|5Vbeing slow to release remains operated continuously during dialing and establishes an obvious circuit for relay |0|0 which also remains operated during dialing and after relay |0|5 releases on the trunk cut through. Y

Relay |0|5, upon operating, also establishes a circuit from ground over its upper contacts, conductor |0|9 and the upper back contact of relay 104 to battery through the winding ofv relay V105, to hold relay 105 operated and the ground is extended over the inner upper back contact of relay 104, and the upper No.1 normal contacts of relay 103, to conductor 5|0, extending to the trunk-finder 500 to replace ground applied to conductor 5|0 by relay 509, which latter relay releases after the trunk-nder has found the calling trunk.

agitata;

the trunk,lconductor.2 I 9 of the loop circuit previously traced through theV middlek winding. of. relay |000 is connected over the lower No.1 alternate contacts of relay 209 and the upper No. 5 back contact of relay 2I0 to the tip conductor 200 of the. ticketing trunk and conductor 229 is connected over the lower No. 5 back contact of relay 2I0,. the` lower No. lback contact of relay 232, the lower No. 2 back contact of relay 2I4, the lower No. 3 contacts of relay 239, the lower No. 2 back contact of relay 2I0, to the ringy conductor 20| of the ticketing trunk, whereby relay |000 is placed under the control of the calling subscriber. Upon release of relay I09=8in response to therst dial impulse received from the calling line, relay I llII operates over a circuit from battery through its winding, over the back contactof relay |998, thelnner lower front contact.4 of relay |046-,l and conductor IOI8 to ground at the upper back contactiof relay 60d and, being slow to release, remainsoperated during an impulse series. Since the present invention is `not concernedr with the registration of series lof dial impulses under the control of relays |008, IOI5, IOI0, and IOII, the impulse counting relays controlled thereby and the digit registers for registering dialed digits are not disclosed. For a full disclosure of Vsuch apparatus and a description of the operation thereof, reference may be had to the application ofr J. W. Gooderham, Serial No. 448,782, led concurrently herewith. With relay IOI operated a circuit is established from ground over its lower front. contact and conductor |0120 to battery through the winding of off-normal relay 103, whichjupon operating connects ground to oit-'nornlalconductorsl 'II2, 'H3 and 'H4 and connects ground directly over its upper No. 1 alternate contacts to conductor I0, extending to the trunknderllll.

Party identification test When off-normal relay 105 operated a circuit was established from' battery over its lower No. 1 contacts, over conductor 'II I, through the lower winding of relay`606, and resistances 6011 and 621, to ground -onoff-normal ground conductor 106, thus -preparing relay 605'101 op-eration and establishes a'circuit for relay 508, which may be traced from battery through the winding thereof, over the lower No. 1 normal contacts of relay 005, to ground on off-normal ground conductor 108.l Relay 60B; upon operating, closes an obvious circuit over its inner upper front contacts through the winding of relay 609 to battery, whereupon relay 609 operates in turn establishing a circuit extendingfrom batteryA on conductor 'II I, through the upper winding oi relay 606, over the inner lower front contact of relay 609,v to ground on conductor 106; With both windings of relay 699 energized, relay 609 operates and establishes a circuit from ground applied to conductor 'H2 upon the operation -of off-normal relay 703, over the front contact of relay 005, the upper back contactof relay 6I 0 to battery through the winding of relay 600.' Relay 600, upon operating, locks over its lower-No. 2 contacts to ground over theinner upper normal contacts of relay 6I0. These relays all remain operated under the control of relay 605.

When the sender was cut through'to the calling-trunk by the operation of relay-520 of the trunk-finder 509 a circuit was established'from ground over the upper No. 3 back contact of relay -208,conductor MI5-,through the winding of trunk connector relay I Illll-v individual to the-calling trunk; of'. the sender-trunkfconnector. circuitof Fig.. .11, over conductor 222; brush 524-" on the trunk-rinden the lower No. 3 contact of relay 520, conductor. 530, the lowerNo. 2 back contact of relay 605,through the windings of the three-position polarized relay 6II, the` upper No. 3..bael contactof relay 6015," through resistance 6|2fto batteryV and ground. Relay GII operates over this circuit in such aJ manner as, to close its lower contacts, whereupon relay 6I3 operates ina cir cuit from battery through its winding, over the lower contact of relay 6| I, to ground on ,off-incr:-` mal ground conductor 109, locks over its upper No. l contacts to ground on conductor 709, and estab'- lishes a -biasing crcuit'from the 11G-volt battery El, vthrough resistance 6M and the vupperwindf ing of relay SI5, over its upper No. 2 contact to ground, wherebyrelayfI is prepared foreperation'.

When relay 10H loperates at the-start'of the rst digit ,tov be registered in the-sender, a: circuit is established fromV ground over a front contact thereof, over tha-front Contact or an in-steering relay (not shown), conductor I92'I', thelower No. l contact of relay GIS, over the upper No. 1 normal contacts and through the winding of relay i'to battery. Relay 605 thereupon operates, locks overiit's .upper No. l alternate Contact to ground on o-normal ground conductor198,and transfers the holding circuitfor relay S98 over its lower No. 1 transfer-contacts from ground on` the off-normal ground conductor- |58 to ground applied. to conductor |02| kby relay` Iii-'i overthe lower Nos. 1 and2 contacts of relay EIS.

.When relay ItIIV releases `at the end of the rst digit series dialedinto the.` senden' relay G08 releases, inturnreleasing relay ,669; which opens the circuitrof condenser tirned'relayI 609 With relay 609 released a .shunt extending from ground on conductor 706; over the innerlower front contact of relay 699, through condenser SIB and resistance -iiII to ground is opened and condenser GIB now starts to charge in a circuit from battery, over conductor lil, through the -upper winding of relay 606,' through condenser @SI5 and resistance 6I? to ground, and until the condenser becomes fully 'charged and the charging current therethrough ceases to flow, relay S96 is maintained operated.

With relays 50S and 09 both released and until relay 696 Iinally releases, a circuitis established from the source M8 'of llo-volt current, through the lower winding of relay 5 i 5, the upper back Contact of relay BIS, through the rectifier 620, over the upper back contact of relay Gili); the lower No. 1 alternate contacts of relay 600 and thence as traced' to the ringconductor 20| of the ticketing trunk and to the ring conductor |S0=of the calling line, and in parallel over the lower back contact of relay 6%, and the upper No. l alternate contacts of relay 682, and-.thence as traced to the tip conductor 2900i the ticketing trunki, and to the tip conductor |89 ofthe calliing line. During the time that the lower winding of relay `6|5is thus connected to the tip'and ring conductors ofv the calling line pulse receiving relay |009 is maintained operated in the circuit previously traced frorn battery through its middle winding toYcond-uctorI, thence over the upper vback contact o'f relay 608, over the upper and lowerrNo. 3 contacts of relayto ground throughV resistanceY 62 I Relay 606 is timed by the condenser--EiIG-and resistance SI'IA to'. release' 4in: etpl'ortmlii'iately .05 secon-d# af-'ter the release 1 of4 relay` 69 and, theres,

fore, the lower winding of party test relay SI is connected to the conductors of the calling line for this interval. If the calling subscriber is a tip party of a two-party flat rate line, relay 6|5 will be operated over .the 3640-ohm resistance ground at such tip station. It having been assumed that the tip party station |8| has initiated the=call it will be noted that with the receiver oi the switchhook thetip conductor |89 of the calling line is connected through the primary winding or the substation repeating coil |90, through the E640-ohm ringer IOI to ground and that the ring conductor |80 is connected through the normal contact of the dial |02, through the transmitter |93 and ringer ISI to ground. Re.- lay'6l5, if operated, establishes a circuit from battery through resistance lamp 622, over the lower No. 1 back contact of relay 623, through the winding of relay 624, over the lower back contact of relay 639, the front contact of relay 6I5, the upper No. 2 contacts of relay 600, the lower back Contact of relay BID, the lower back contact of relay 606 to ground on off-normal ground conductor |'|2. Relay 624, upon operating, locks over its upper No. 1 contacts, conductor E25, the lower back vContact of end-of-dialing relay 803 to ground on off-normal ground conductor |I2; establishes the operating circuit of relay 606 from ground on conductor 625, over its upper No. 3 contact, the lower No. 3 back contact of relay Gig, through the upper winding of relay 606 to battery on conductor '|Il; establishes a circuit from ground on conductor 625, over its upper No. 2 contacts, through the lower winding of relay SIS to battery; opens at its lower No. l back contact the operating circuit of relay 623, and at its lower No. 1 front contact connects battery through lamp G25 and over the upper No. 3 back contact of relay SIB to the line side of the lower Winding of relay SI5.

Relay GIS, upon operating, extends its operating ground over its upper No. 1 contacts and through the upper winding of relay 'H6 to battery; connects ground over its lower No. 1 contacts to shunt resistance 601 from the circuit through the lower biasing winding of timing relay S; opens the circuit through the upper or operate winding of relay 606; disconnects the 11G-volt source of current 6|8 from the subscribers line and establishes the circuit of relay Sic extending from ground over its lower No. 2 contacts to battery through the winding of relay 6|0. With resistance 661 shunted relay 606 releases approximately .015 second following the opening of its operating circuit and until it releases relay 606 is held operated over its own lower No. 2 contacts, the inner upper alternate contact of relay Eli) and the front contact of relay 666 to ground on off-normal conductor '|I2. During the time that relay 605 remains operated current from the 48-volt central oiiice battery is applied through lamp 626, over the lower No. 1 front contact of relay 624, through rectifier 620, the upper back contact of relay 669 and in parallel over the lower back contact of relay 608, and thence as traced over the No. 1 upper and No. 1 lower alternate contacts of relay 500 to the calling line. When relay 606 releases it in turn releases relay 660 and disconnects the source from the line. This application of current from the 48-volt battery is for the purpose of discharging the line in such a way as to prevent bell tapping at the substation.

With relay 608 released the previously traced circuit over the calling line and through the middie winding of relay |000 ls reestablished and the local holding circuit for relay |000 is opened.V The party identication is now completed and the sender is ready to receive the next digit series dialed by the subscriber. A complete test cycle, that is, testing the line, discharging the line after the test, and the functioning of the test control relays as just described, is such that the open period introduced into the dialing circuit does not exceed .015 second.

If the calling substation is not a tip party of a two-party flat rate line, relay 6|5 will not operate when relay 606 releases for the rst time. With relay 6|5 unoperated, when relay 606 releases a circuit is established from ground on conductor ||2, over the back contact of relay 606, the lower back contact of relay 6|0, the upper No 2 contacts of relay 600, the back contact of relay 6 |5, the winding of relay 623, over the lower No. 1 back contact of relay 624, through lamp 626, tobattery. Relay 623 thereupon operates causing the operation of relays 619 and 'H1 in the manner previously described in connection with the operation of relays 6|9 and 1|6. The circuit then functions in the manner previously described.

At the end of the party identication test relays EIU, 6|9 and 624 remain operated if the calling party is the tip party of a two-party flat rate line under the control of the end-oi-dialing relay 803 and relay I I6 is held operated in a circuit over its lower Winding and lower No. 1 contacts to ground on oil-normal conductor '|I2 under the control of oir-normal relay 103. With -relay I6 operated relay H8 is operated from battery through its winding, over the upper No. 1

`contacts of relay l I6, and the upper No. 2 back contact of relay 1|| to ground and relay H8 is held operated over its upper contacts to ground on off-normal conductor 706 under the control of off-normal relay 105. If the calling party is not a tip party, relays 6|0, BIS and 623 remain operated under the control of relay 803, and relay 1li is held operated in a circuit over its lower winding and lower No. 1 contacts to ground on conductor '|I2 under the control of relay 103.

When the rst digit has been received in the sender an idle identifier, such as is disclosed yschematically by the box 900 on Fig. 9, is associated with the sender by an identifier connector and the identifier is associated with the calling ticketing trunk by an identier trunk connector circuit. If, as a result of the party test, relay .TIB has been operated, a circuit ls established from ground, over its upper No. 3 contacts and conductor 1|0, thence over contacts of the identifier connector to the identifier 900 to operate `va tip party relay therein to register the fact that the tip party on a two-party flat rate line has lf ring party relay '|I'| has been operated, a circuit would be established fromground over its upper No. 2 contacts and conductor 120, extended over contacts of the identifier connector to the identifier 900 to operate a ring'party relay therein. Upon the operationvof the identifier trunk connector a circuit is established for relay 2I8 of the trunk which may lbe traced in part from the identifier 900, over conductor extended over contacts of the Yidentifier connector to conductor 529, thence over the No. 2 lower contacts of relay 520, trunk-finder brush 523; conductor 22|, through the winding of the three-position polarized relay 2I8 of the trunk, over the'upper No. 4 contacts of relay` 2 |5, andthroughlresistance 238 to battery and over 

